a seal is a creature that we are all familiar with, referring to mammals, carnivores, and seals. They live in the ocean. Although their living environment is quite different from that of terrestrial mammals, they are actually mammals, and they can not be regarded as fish because they live in the same environment as fish. Seals originally lived on land, but because of the change of terrain, they lived in the sea. Therefore, they are a kind of mammals living in the sea, which is different from fish and terrestrial mammals.
As a mammal, seals have some key characteristics that meet the requirements of mammals. Seals, for example, reproduce viviparously. After giving birth, the mother uses her mother's milk to produce offspring. When they breed and give birth and suckle, they usually do it on land. In addition, seals also use lungs to breathe, which is unique to mammals. In addition, seals live in the water and are aquatic mammals, so they are also very different from terrestrial mammals. For example, the body shape of seals is streamlined, and their limbs are like fins, which are suitable for aquatic environment, which is very different from terrestrial animals.
As mentioned above, the seal refers to mammals, carnivores, seals in the family of organisms, so it belongs to mammals. As a mammal, seals are unique in their breeding methods and breathing patterns. They reproduce viviparously and have a lactation period after giving birth; In addition, their respiratory organs are lungs.
